Scalable Ir‑Doped NiFe_(2)O_(4)/TiO_(2) Heterojunction Anode for Decentralized Saline Wastewater Treatment and H_(2) Production  

作　　者：Sukhwa Hong Jiseon Kim Jaebeom Park Sunmi Im Michael R.Hoffmann Kangwoo Cho 

机构地区：[1]Division of Environmental Science and Engineering,Pohang University of Science and Technology(POSTECH),Pohang 790−784,Korea [2]Linde Laboratory,California Institute of Technology,Pasadena,CA 91125,USA [3]Institute for Convergence Research and Education in Advanced Technology(I‑CREATE),Yonsei University International Campus,Incheon 21983,Republic of Korea

出　　处：《Nano-Micro Letters》2025年第3期1-18,共18页纳微快报（英文版）

基　　金：supported by the National Research Foundation of Korea(NRF)grants(2022R1A2C4001228,2022M3H4A4097524,2022M3I3A1082499,and 2021M3I3A1084818);the Technology Innovation Program(20026415)of the Ministry of Trade,Industry&Energy(MOTIE,Korea);the supports from Nanopac for fabrication of scaled-up reactor.

摘　　要：Wastewater electrolysis cells(WECs)for decentralized wastewater treatment/reuse coupled with H_(2) production can reduce the carbon footprint associated with transportation of water,waste,and energy carrier.This study reports Ir-doped NiFe_(2)O_(4)(NFI,~5 at%Ir)spinel layer with TiO_(2) overlayer(NFI/TiO_(2)),as a scalable heterojunction anode for direct electrolysis of wastewater with circumneutral pH in a single-compartment cell.In dilute(0.1 M)NaCl solutions,the NFI/TiO_(2) marks superior activity and selectivity for chlorine evolution reaction,outperforming the benchmark IrO_(2).Robust operation in near-neutral pH was confirmed.Electroanalyses including operando X-ray absorption spectroscopy unveiled crucial roles of TiO_(2) which serves both as the primary site for Cl−chemisorption and a protective layer for NFI as an ohmic contact.Galvanostatic electrolysis of NH4+-laden synthetic wastewater demonstrated that NFI/TiO_(2)not only achieves quasi-stoichiometric NH_(4)^(+)-to-N_(2)conversion,but also enhances H_(2)generation efficiency with minimal competing reactions such as reduction of dissolved oxygen and reactive chlorine.The scaled-up WEC with NFI/TiO_(2)was demonstrated for electrolysis of toilet wastewater.

关 键 词：Wastewater electrolysis cell Ir-doped NiFe_(2)O_(4) Reactive chlorine species Decentralized H_(2)production On-site wastewater treatment 

分 类 号：TQ116.2[化学工程—无机化工] X703[环境科学与工程—环境工程]